The team from Georgia Tech, Emory, and Yonsei University in Korea created the delivery device by developing tiny polystyrene bubbles designed to be filled with drugs, corked by a phase-change material and injected into the patient. The bubbles would then travel through the body to the target site, which would be warmed by a heating element. Upon arrival at the site, the phase-change material would dissolve to release the drug in the optimal location.